单项选择题

How the fire in the dancing hall started （） a mystery.

A．to remain
B．remains
C．remain
D．is remaining

相关考题

The middle-aged man was seen （） out of the house on the...

单项选择题The middle-aged man was seen （） out of the house on the afternoon of the murder.

A．came
B．Come
C．to come
D．have come

--Can I help you --I' d like to have a （） of China Dail...

单项选择题--Can I help you --I' d like to have a （） of China Daily.

A．piece
B．sheet
C．loaf
D．copy